One of the most used sauces in United States in my experience, from side dishes to a principal component in salads, is Mayonnaise. It is really popular because of the versatility and lemon flavor that can go a long with any protein. Some of the restaurants name it different things like aioli or emulation but the base is the same.
I do not really remember when I tried for first time, but I remember my grandma pulled out from the fridge a homemade Mayonnaise that tasted lemony with a delicious creamy texture. Nothing more elegant and delicate than that mayo. Here is the recipe!
Egg yolk 2ea
Vegetable oil 2 cups
Lemon juice 1ea
Salt & white pepper
In a bowl, put the egg yolks, salt and pepper, and start to whip them with a whisk.
Whipping constantly, add the oil slowly until all the ingredients are combined.
Finish with lemon juice and double check the seasonings.